EFFECT OF BACKFILL SOIL CONDITIONS ON SEISMIC RESPONSES OF PRESTRESSED CONCRETE FRAME BRIDGE WITH DIAGONAL MEMBERS

2020 ◽  
Vol 76 (4) ◽  
pp. I_21-I_31
Author(s):  
Shunichi HIGUCHI ◽  
Atsushi TAKEDA ◽  
Tomoaki NISHITANI ◽  
Toshihiko NAGATANI
Keyword(s):  
Prestressed Concrete ◽  
Soil Conditions ◽  
Seismic Responses ◽  
Concrete Frame ◽  
Backfill Soil

scholarly journals Experimental Study of a New Precast Prestressed Concrete Joint

2018 ◽  
Vol 8 (10) ◽  
pp. 1871 ◽  
Author(s):  
Xueyuan Yan ◽  
Suguo Wang ◽  
Canling Huang ◽  
Ai Qi ◽  
Chao Hong
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Frame Structure ◽  
Loading Test ◽  
Concrete Frame ◽  
Concrete Joints ◽  
Precast Prestressed Concrete

Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.

Inelastic Dynamic and Non-Linear Static Seismic Performance of a Building with RC Walls that Collapsed in the Chile’s Earthquake of February 2010 and a Building with RC Concrete Frame Designed in the Mexico City

2014 ◽  
Vol 627 ◽  
pp. 161-164
Author(s):  
Jorge A. Avila ◽  
David A. Lopez ◽  
Jorge Arturo Avila-Haro
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Federal District ◽  
Seismic Responses ◽  
Concrete Wall ◽  
Structural Walls ◽  
Concrete Frame ◽  
Nominal Strength ◽  
Dominant Period ◽  
Chilean Earthquake

The objectives in this paper are the followings: evaluate the seismic performance of the three buildings and compare the elastic and inelastic seismic responses of the buildings, calculated with the records CCH-NS (Chilean earthquake 2010) and SCT-EW (Mexican earthquake 1985) of the cases of strengths elastic and inelastic with nominal strength and over-strength of each model. The building 1 is a real case of a concrete wall building that collapsed during the Chilean earthquake of February 27, 2010. The building 2 was analyzed and designed with the Chilean Norm “Seismic Design of Buildings” (NCH-433) and “Reinforced Concrete–Design and Calculus Requirements” (NCH-430). The analyses and design of the building 3 was realized with the Mexican Norms “Complementary Technical Norms for seismic design” (NTC-Seismic), “Complementary Technical Norms for Design and Construction of Concrete Structures” (NTC-Concrete) of the “Code of Constructions for the Federal District” (RCDF-04). The elastic and inelastic seismic responses of each building were calculated with the step by step dynamic method. Should be avoided that the fundamental period of vibration of the structures match with the dominant period of the ground (Ts). In the design of concrete structural walls is very important classified the walls according to its slenderness in order to recognize the behavior that will govern the wall, and with it determine the detailed of the steel reinforcement that could provide the best behavior when the wall be submitted to an important earthquake.

Characteristic Analysis of Prestressed Concrete Frame Joints with Spread-Ended Beams

2014 ◽  
Vol 578-579 ◽  
pp. 648-652
Author(s):  
Qing Wen Liu ◽  
Fu Qiang Wu
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Prestressed Concrete ◽  
Outer Region ◽  
Low Frequency ◽  
Core Region ◽  
Seismic Loads ◽  
Characteristic Analysis ◽  
Concrete Frame ◽  
Reversed Loading

Three joints of prestressed concrete frame are studied under low frequency reversed loading. The failure and cracks feature, damage characteristics and mechanical properties under seismic loads are comparatively analysed between joints with spread-ended beams and conventional joints. Studies show that the layout of prestressing tendons and joints with spread-ended beams have little influence on the bearing capacity and ductility. Prestressing tendons through the joint core region can improve the shear strength of joints, but tendons through the joint outer region can not. We need to only consider the influence on the area of prestressing tendons through joint core region when calculating the shear strength of joints.

scholarly journals Experimental and Numerical Study of Seismic Performance of Precast Prestressed Concrete Frame Internal Connection

2015 ◽  
pp. 406-413
Author(s):  
Xiandong Liao ◽  
Xiang Hu
Keyword(s):  
Seismic Performance ◽  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Numerical Study ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Concrete Frame ◽  
Internal Connection ◽  
Load Carrying ◽  
Precast Prestressed Concrete

The seismic performance of the internal connection of precast prestressed concrete frame was studied systematically, based on the experiment of full-scale model under low cyclic reversed loading. This study was mainly focused on failure pattern, load-carrying capacity, skeleton curves, and hysteresis curves. Furthermore, a nonlinear finite element analysis using Abaqus was carried out to study the characteristics of the internal connection of precast prestressed concrete frame. Results revealed that the damage was concentrated mainly on beam end owing to flexural action, while steel bars in the columns and stirrups in the core region remained elastic until failure occurred. The calculated value of the load-carrying capacity of the internal connection was similar to the experimental one. Present study can be referenced for the application of precast prestressed concrete frame in high seismic zones.

scholarly journals Evaluation and Study of Prestressed Slab Structure Precast Modular Concrete

2020 ◽  
Vol 26 (1) ◽  
pp. 44-51
Author(s):  
I Gusti Lanang Bagus Eratodi ◽  
Ali Awaludin ◽  
Ay Lie Han ◽  
Andreas Triwiyono
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slab ◽  
Production Quality ◽  
Quality Data ◽  
Soil Conditions ◽  
New Production ◽  
Slab Geometry ◽  
Concrete Core ◽  
Concrete Quality ◽  
Vehicle Loads

Prestressed precast modular concrete slabs function rigid pavement, supporting vehicle loads above it on subgrade with relatively low bearing capacity. This slab measures 2000 x 850 x 150 mm3 of regular reinforced concrete (old production) or prestressed concrete (new production) quality K-500. After several times of use, damage occurs mainly at the end of the slab in the form of spalling. The objectives of the study and evaluation were: (1) observing damage; (2) material quality data; (3) numerical modeling by taking into account material properties, loading and soil conditions; and (4) providing slab design recommendations including materials and geometrics. The method of study and evaluation of slab damage was done by observing the damage, taking concrete core-case and testing it in the laboratory, and modeling the slab structure with various parameters (soil data, concrete quality and slab geometry). Field observations and analysis results show that concrete slab spalling occurs initially at the edge (850 mm wide) which in turn causes the effectiveness of the pre-tension force to be suboptimal and finally the concrete spalling volume increases. Apart from the frequency of collisions during installation and slab deformation when supporting vehicle loads. Concrete spalling problems also due to inappropriate concrete quality.

Sign in / Sign up

Export Citation Format

Share Document