Housing Damage Trend Detection is an architectural term that refers to the process of monitoring the damage caused or likely to be caused by deformation, displacement, cracks and other damages to the house by the external influencing factors such as neighboring projects or by the internal influencing factors of the house such as design, construction and use.

Housing damage trend detection needs to be tested over a period of time to monitor the house, in order to determine the damage trend of the house, is a monitoring and comprehensive judgment process, which applies to various factors may cause or has caused damage or has caused damage to the house needs to be monitored.

The main testing parameters of the process are:

Tilt, settlement, cracks, foundation, masonry structural members, wood structural members, concrete structural members, steel structural members, etc., and the testing of each parameter is generally on-site.

The off-site testing items are:

a. In the detection of concrete structural components, concrete strength is detected by concrete core drilling method;

b. In the detection of steel structural components, steel tensile strength test method detects the tensile strength of steel specimen, and steel bending strength test method detects the bending deformation capacity of steel specimen. 

c, in the detection of wood structural members, compressive, tensile and shear strength test of wood smooth grain, bending strength and modulus of elasticity test of wood, compressive strength test of wood cross grain.

Detection process:

1. Initial detection: take the average value as the initial value for monitoring. According to the structural characteristics and influencing factors of the house, the monitoring program is formulated .

2. Monitoring of damage trend: Regularly observe and record the generation and development of the damage phenomenon of the house. Analyze the monitoring data in time, draw the change curve, analyze the rate of change and the cumulative value of change, and notify the commissioning party in time if any abnormality is found.

3、Re-measurement：Calculate the cumulative total value of vertical displacement, horizontal displacement and tilt of the house. Analyze the causes of damage to the house, assess the degree of damage to the house in accordance with the Standard for Assessment of House Completion Level (Trial Version) and the Standard for Identification of Dangerous Houses (CJ13), and put forward corresponding treatment measures.