Expanded Database Assessment of Design Methods for Spread Foundations under Axial Compression and Uplift Loading

The axial compressive behaviour of an innovative type of square concrete filled steel tube (CFST) column to reinforced concrete (RC) beam joint was experimentally investigated in this paper. The innovative joint was designed such that (i) the steel tubes of the CFST columns were completely interrupted in the joint region, (ii) the longitudinal reinforcements from the RC beams could easily pass through the joint area and (iii) a reinforcement cage, including a series of reinforcement meshes and radial stirrups, was arranged in the joint area to strengthen the mechanical performance of the joint. A two-stage experimental study was conducted to investigate the behaviour of the innovative joint under axial compression loads, where the first stage of the tests included three full-scale innovative joint specimens subjected to axial compression to assess the feasibility of the joint detailing and propose measures to further improve its axial compressive behaviour, and the second stage of the tests involved 14 innovative joint specimens with the improved detailing to study the effect of the geometric size of the joint, concrete strength and volume ratio of the steel meshes on the bearing strengths of the joints. It was generally found from the experiments that (i) the innovative joint is capable of achieving the design criterion of the ‘strong joint-weak member’ with appropriate designs, and (ii) by decreasing the height factor and increasing the volume ratio of the steel meshes, the axial compressive strengths of the joints significantly increased, while the increase of the length factor is advantageous but limited to the resistances of the joint specimens. Because of the lack of existing design methods for the innovative joints, new design expressions were proposed to calculate the axial compression resistances of the innovative joints subjected to bearing loads, with the local compression effect, the confinement effect provided by the multi-layers of steel meshes and the height effect of concrete considered. It was found that the proposed design methods were capable of providing accurate and safe resistance predictions for the innovative joints.

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Bearing Capacity of Concrete-Filled Steel Tube Column Sections under Long-Term Loading

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.j9750.0881019 ◽

2019 ◽

Vol 8 (10) ◽

pp. 3530-3536

Keyword(s):

Bearing Capacity ◽

Axial Compression ◽

Steel Tube ◽

Design Methods ◽

Contribution Ratio ◽

Concrete Filled Steel Tube ◽

Numerical Example ◽

European Code

This article presents the design methods for concrete filled circular columns subjected to long-term axial compression and bending. . There are two approaches: stress-based and strain-based for formulations. Both approaches are specified in Russian Code, SP 266.1325800.2016, and in European Code, EN 1994-1-1:2004. A numerical example shows the procedures to calculate the strength of a given column according to two different Codes, the influence of parameters such as steel contribution ratio, relative slenderness to the results in two methods are consider.

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Experimental Study on Axial Compression Behavior on Circular Timber Columns Strengthened with CFRP Strips and Near-Surface Mounted Steel Bars

Journal of Structural Engineering ◽

10.1061/(asce)st.1943-541x.0002931 ◽

2021 ◽

Vol 147 (3) ◽

pp. 04021003

Author(s):

Siha A ◽

Changdong Zhou ◽

Ligan Yang

Keyword(s):

Experimental Study ◽

Axial Compression ◽

Near Surface ◽

Compression Behavior ◽

Steel Bars ◽

Near Surface Mounted

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Section 4.a Introduction

Conference Proceedings of the Academy for Design Innovation Management ◽

10.33114/adim.2017.239 ◽

2019 ◽

Vol 1 (1) ◽

Author(s):

Silvia PIZZOCARO ◽

Pınar KAYGAN ◽

HARMAN Kerry ◽

Erik BOHEMIA

Keyword(s):

Social Problems ◽

Elderly Care ◽

Child Poverty ◽

Design Methods ◽

Innovative Solutions ◽

Design Council

Co-design is a process in which designers and users collaborate as ‘equals’ to develop innovative solutions. Co-design methods are increasingly used by professional designers to facilitate and enable users to co-develop innovative solutions for ‘themselves’. For example, the Design Council is advocating the use of co-design methods to support the development of practical innovative solutions to social problems such as increased cost of elderly care and tackling child poverty. The involvement of users in developing solutions acknowledges that their take up is dependent on the ways users create and negotiate meanings of objects and services.

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Design as an Agent for Public Policy Innovation

Conference Proceedings of the Academy for Design Innovation Management ◽

10.33114/adim.2019.06.231 ◽

2019 ◽

Vol 2 (1) ◽

Cited By ~ 1

Author(s):

Federico VAZ ◽

Sharon PRENDEVILLE

Keyword(s):

Public Policy ◽

Process Model ◽

Public Policies ◽

Policy Innovation ◽

Design Methods ◽

Policy Effectiveness ◽

The Public ◽

Dependent Activity ◽

Effectiveness And Efficiency ◽

Context Dependent

Described as units developing public policies in a design-oriented manner, Policy Labs are tasked to innovate to gain in policy effectiveness and efficiency. However, as public policymaking is a context-dependent activity, the way in which these novel organisations operate significantly differs. This study discusses the emergence of design approaches for policy innovation. The purpose is to map how Policy Labs in Europe introduce design approaches at distinct stages of the policymaking cycle. For this study, 30 organisations in Europe operating at various levels of government were surveyed. Based on the public policymaking process model, it investigates which design methods are Policy Labs deploying to innovate public policies. The study exposed a gap in the awareness of the utilised methods' nature. It also showed that the use of design methods is of less importance than the introduction of design mindsets for public policy innovation, namely ‘user-centredness’, ‘co-creation’, and ‘exploration’.

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